Carrier 1 rotates about fixed axis A and is connected by a turning pair to planet gear 3 which meshes with fixed internal sun gear 4. Crank 5 is rigidly attached to (or integral with) gear 3 and is connected by turning pair B to slider 6 which moves along slot a-a of link 2. Link 2 slides in fixed guide c. The pitch radius of gear 4 equals R=1.5r, where r is the pitch radius of gear 3. Point B describes path b-b, which is a square with rounded corners and is a prolate hypocycloid. When carrier 1 rotates at uniform velocity, link 2 reciprocates and has long dwells at the ends of its stroke when point B travels along the straight vertical portions of its path b-b. It travels with approximately uniform velocity in the middle of its stroke when point B is on the straight horizontal portions of its path.
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